Syringe



(No Model.)

P. J. MOELROY.

SYRINGE.

No. 288,828. Patented Nov. 20, 1883.

UNITED STATES PATENT OFFICE.

PATRICK J. MCELROY, OF EAST CAMBRIDGE, MASSACHUSETTS.

SYRINGE.

SPECIFICATION forming part of Letters Patent No. 288,828, dated November 20, 1883.

Application filed September 30, 188).

To all 1071 0112 it may concern.-

Be it known that I, PATRICK J. MOELROY, of East Cambridge, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Syringes, of which the following is a full, clear, and exact description.

This invention relates to syringes made of glass; and it consists in the combination therewith of a packing for the plunger or piston head, made of asbestus, all substantially as hereinafter described, reference being had to the accompanying plate of drawings, in which Figure 1 is a central longitudinal section, and Fig. 2 a cross-section on line 2 2, Fig. 1.

In the drawings, A is the cylinder, and B the piston or plunger head, of the syringe, both made of glass, and in the usual manner. The pistonhead is wound with abestus, a, in the form of yarn, sufliciently to pack the syringe against leakage between the piston-head and cylinder when the syringe is used. The packing of asbestos is advantageous, in that it resists all acids; that it makes a most reliable and tight joint without increase in friction to (No model.)

a detrimental degree; that it does not absorb liquids, and consequently does not swell, nor does it shrink, and practically is of uniform and equal tightness at all times, and as a consequence in no way renders the syringe liable 0 to breakage, as in the case with all other packings heretofore used for glass syringes.

The application of the asbestus to the pis ton-head can be in any other form than as de scribed, if desired, although good practical 35 results are secured as described.

Having thus described my invention, What I claim, and desire to secure by Letters Patent, is

A syringe having its cylinder A and plunger 40 B made of glass, and the latter provided with a packing of asbestus, substantially as described, i'or the purpose specified.

In testimony whereof I have hereunto set my hand in the presence of two subscribing 5 

